This slide maintenance kit provides the complete set of replacement springs for the FN 509 slide assembly. Use it to restore factory-spec spring tension after extended round counts, addressing sluggish slide return, light primer strikes, or inconsistent ejection. Rated for 10,000-round service intervals, this component is a direct drop-in replacement — no fitting, no gunsmithing required.
Compatibility
- FN 509 (full-size)
- FN 509 Compact
- FN 509 Midsize
- FN 509 Tactical
- FN 509 LS Edge
Does not fit FN 509 MRD or FN 509 CC Edge without verification of slide spring geometry.
Key Features
- Kit includes: striker spring, extractor spring, and firing-pin safety spring
- 10,000-round service life per spring set (normal pressure ammunition)
- Direct drop-in — no fitting, no file work
- Replaces worn OEM springs without changing trigger pull weight or sear engagement
- Packaged as a complete set for one-time replacement
Install Difficulty
2 out of 5
Requires: punch set (for extractor pin), small hammer, slave pin or paperclip for firing-pin safety spring compression.
Estimated time: 15–25 minutes. Armorer-level knowledge of FN 509 slide disassembly recommended. No permanent modifications required.
FAQ
What springs are included in this kit?
Striker spring, extractor spring, and firing-pin safety spring. The kit does not include the recoil spring assembly, trigger return spring, or magazine catch spring.
Will this change my trigger pull weight?
No. This kit replaces slide-component springs only. It does not affect sear engagement or trigger bar spring tension. Pull weight remains as configured by your trigger system.
How often should I replace these springs?
Apex recommends replacement every 10,000 rounds as a preventative measure. If you experience light strikes, inconsistent extraction, or a dead trigger after disassembly, inspect and replace the relevant spring immediately.
Shipping: Ships same business day if ordered before 2 PM EST. Warranty: All components carry a limited lifetime warranty against manufacturing defects. Springs are wear items — normal fatigue after 10k rounds is not covered. Contact us for RMA instructions if you receive a damaged or incomplete kit.
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